time to change my cam . my car presently has the popular mechanics cam from the gs club think its to mild for my combo. here's my combo car, 70 gs kind of heavy loaded built 2004r od 2800 stall 373:1 12 bolt posi motor 462 trw forged L2353 notched 26 cc?balanced blueprinted 0 deck felpro head gaskets some wher over 10:1 compression pop mech cam mt headers,3' exhaust with x pipe mallory 140 w return holley 870 peice of sh!7 that will be going in the garbage soon. msd dist and 6al 1970 stage 1+ ported heads from amp 71 cc chambers flow #s avg lift intake exhaust .100 70 67 .200 145 115 .300 212 147 .400 259 169 .450 265 176 .500 260 182 any suggestions would be great :3gears: :3gears:
I get my cams from StraightLine Performance in MI and have not been disappointed. Scott will custom grind one for your combo. 1-517-381-8801.
Use the DCR calculator to help in finding a grind that will maximize your performance with the gas you plan to use.
cams Dave, Use the included link along with some different cams' intake closing numbers to calculate your dynamic compression ratio. Try to get it 8.0 - 8.2. This number represents the maximum pump gas c.r. You don't want to overcam with your small 9.831 scr. You would have a lazy idle and low end. I don't know your pop cam's intake closing number off head. Here's an example: The Hemi-Killer cam (110LDA) has an intake closing number of 50.5 at .050" (add .015" to it to use it in the dcr calculator in the site "kb-silvolite"). With your supplied data and the data from the bigger and more aggressive Hemi-Killer cam I used to run, I come up with 9.831scr (your motor) and 7.798dcr (with the cam). This would be a good choice if you don't mind a slightly less responsive/lazy idle. You would have to run more initial timing (20) to make it obey on the street. But, I ran this cam (with more compression) and really liked it. It's very strong all over the range. I think you could pull it off without overcamming. I have beed there. At your compression ratio, undercamming is much better than overcamming. You are in a difficult situation. Your cam right now may be the best for your scr. But, you want to change it. So, do the research. Call the cam makers for the data on the cams you intend to study. The dcr is a great tool. I wish I knew how to use it earlier. If you can find a (110LDA=more aggressive sounding) 110LDA cam /230*-240*/ .510" that yields a dcr of 8.1 with your engine, use it. You won't be disappointed on the street running 92-octane only. Happy hunting.
